Question

我想显示图像的网格视图但我希望每次我打开视图图像采取随机值我的意思是不同的imgs

public class database extends HttpServlet 

{

private static final long serialVersionUID = 1L;

String firstname;
String lname;
String Email;
String ContactNo;
String Address;
String town;
String pincode;
String pancard ;
String voterId;
String f1,f2,f3,f4,s1,s2,s3,s4;

/**
 * @see HttpServlet#HttpServlet()
 */
public database() {
    super();
    // TODO Auto-generated constructor stub
}

/**
 * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
 */
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
    // TODO Auto-generated method stub
}

/**
 * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
 */

protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException 
{
    Connection con = null;
    PreparedStatement ps = null;
    ResultSet rs = null;
    Statement st = null;
    PrintWriter pwinsert = response.getWriter();
     firstname=request.getParameter("fname");
     lname=request.getParameter("lname");
     Email=request.getParameter("email");
     ContactNo=request.getParameter("contactNo");
     Address=request.getParameter("address");
     town=request.getParameter("fname1");
     pincode=request.getParameter("fname2");
     pancard=request.getParameter("fname3");
     voterId=request.getParameter("fname4");
     f1=request.getParameter("firstimgval1");
     f2=request.getParameter("secimgval1");
     f3=request.getParameter("thirdimgval1");
     f4=request.getParameter("forthimgval1");
     s1=request.getParameter("firstimgval2");
     s2=request.getParameter("secimgval2");
     s3=request.getParameter("thirdimgval2");
     s4=request.getParameter("forthimgval2");
      try {
          Class.forName("oracle.jdbc.driver.OracleDriver");
          System.out.println("driver  loaded");
      }
      catch(ClassNotFoundException ex)    {
          System.out.println("driver not loaded");

      }


      String URL = "jdbc:oracle:thin:@localhost:1521:xe";
      String Username = "system";
      String Password = "toushif";
    try
    {


         con = DriverManager.getConnection(URL,Username,Password);
         ps = con.prepareStatement("INSERT INTO TOU1 (MOBILE,LNAME,FNAME,EMAIL,ADDRESS) VALUES (?,?,?,?,? )");
         ps.setString(1,ContactNo); 
         ps.setString(2,lname);
         ps.setString(3,firstname);
         ps.setString(4,Email);
         ps.setString(5,Address);


         int i = ps.executeUpdate();
         pwinsert.println(i);

         if(i!=0)  
         {
             pwinsert.println("data has been stored");





         }
         else    {
             pwinsert.println("data could not be stored");
         }
    }
    catch(Exception e)
    {
        e.printStackTrace();
    }

    // TODO Auto-generated method stub
}

Answer 1

步骤

假设您从数据库中获取了list
将此list设置为http-request attribute。
并从RequestDispatcher获取httpRequest。

然后在JSP中使用

<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %>
<Table>
<Tr>
     <td>col1</td> 
     <td>col2</td>
</tr>
<c:forEach var="i" items="${listName}">
  <tr>
      <td>
        <c:out value="${i['col1']}"/>
      </td>          
      <td>
        <c:out value="${i['col1']}"/>
      </td>
  <tr>
</c:forEach>
</table>

我有8x8的表我想在jsp中随机显示图像或值

1 个答案: